Paul Andrew Mayewski¹,
Rick Schneider², Steven Arcone³,
Brian Welch4, Andrei Kurbatov¹ and other members of the the 2006 – 2007 US ITASE traverse
Preamble: This report includes a brief introduction to ITASE, US ITASE Phase 1 (1999-2003) and details of the first portion (2006-2007) of Phase 2 US ITASE. Previous US ITASE Annual Field Reports (1999-2000, 2000-2001, 2001-2002, 2002-2003) describing logistics and science are available at (Field Reports on this web site). In this report we provide the first combined US ITASE and RPSC annual field report in the hope that this form of reporting will enhance communication between US ITASE and components of RPSC that provide logistic support to US ITASE.
US ITASE is foremost a scientific endeavor that seeks to collect the highest quality scientific data under the safest and most efficient conditions possible. It has been operating successfully as a traverse platform since 1999 and as of 2007-08 will be entering its 6th field season. The lessons learned over this period are no doubt similar to those emanating from other remote scientific field operations, but they are nonetheless well worth reiterating. These lessons are listed below in addition to the application of these lessons to planning for the 2007-08 field season. Details pertinent to these defining principles appear throughout the remainder of the report.
ITASE is a multi-national (20 nations), multi-disciplinary field research program with the broad aim of understanding the recent environmental history of Antarctica and the Southern Ocean). Primary emphasis is placed on collecting records covering the last ca. 200 to 1000 years of past climate over Antarctica (Fig. 1) to allow examination of the modern anthropogenic era plus at least the previous 100 years of naturally forced climate.We conduct our research at selected sites to include the two most recent analogs for cold and warm climates, the Little Ice Age and the Medieval Warm Period, respectively.
ITASE evolved from discussions between representatives from several national ice coring programs during a meeting hosted by the European Science Foundation in Grenoble, France in 1990. Twelve nations formulated the original concept (Australia, Canada, China, France, Italy, Germany, Japan, Russia, Sweden, Switzerland, the United Kingdom and the United States) at the suggestion of the US representative to that meeting (P. Mayewski). Scientists from Belgium, Brazil, Chile, Canada, India, Korea, New Zealand and Norway have since joined the program.
ITASE was formally accepted in 1991 by the overarching international committee for Antarctic research, the Scientific Committee on Antarctic Research (SCAR), as one of its primary initiatives. ITASE is officially recognized as a Scientific Program Group. It was adopted as an IGBP (International Geosphere-Biosphere Program) Project in 1993. The SCAR ITASE Project Office is located at the University of Maine along with the US ITASE Scientific Management Office.
Since the initiation of ITASE, several international workshops have been held for purposes of organization and data interpretation. One of these workshops led to the development of an international Science and Implementation Plan for ITASE (Mayewski and Goodwin, 1997, see www.climatechange.umaine.edu). Other international workshops have taken place in Durham, New Hampshire (1999), Potsdam, Germany (2002), Milan, Italy (2003), Bremen, Germany (2005), and Hobart, Tasmania (2006). These workshops have provided important venues for data sharing, concept development, preparation of joint publications, and coordinated logistics planning.
US ITASE is effectively a polar research vessel. It offers the ground-based
opportunities of traditional style traverse
travel coupled with the modern technology of GPS navigation, crevasse
detecting radar, remote sensing, satellite
communications and multi-disciplinary research. By operating as a ground-based
transport system US ITASE offers
scientists the opportunity to experience the dynamic environment they
are studying. US ITASE also offers an important
interactive venue for research through multi-disciplinary interactions
similar to that afforded by oceanographic
research vessels and large polar field camps, without the cost of the
former or the lack of mobility of the latter. More
importantly the combination of disciplines represented by US ITASE
provides a unique, multi-dimensional (space
and time) view of the atmosphere, the ice sheet and their histories.
When US ITASE Phase 1 reached South Pole
at the end of the 2002-2003 field season, it had sampled the physical
and chemical environment of West Antarctica
over spatial scales in excess of 5500 km and 3500 m in depth, and over
time periods ranging from several hundred
years (at sub-annual scale) from ice cores to thousands of years from geophysical techniques.
A list of scientific products (abstracts, papers, reports) produced by research teams involved in US ITASE is available in:“Toward a High Resolution Southern Hemisphere Climate Reconstruction: Mapping the Antarctic ice sheet in space and tim” produced by Members of US ITASE available at (Climate Reconstrution Paper on this web site). Among the scientific accomplishments of US ITASE thus far are:
The results of many of these projects are contained in peer-reviewed papers in a dedicated special volume of Annals of Glaciology (volume 41) plus in several other journals.
In addition to the foregoing US ITASE and ITASE have been instrumental in producing a document entitled: State of the Antarctic and Southern Ocean Climate System (SASOCS) prepared for the Antarctica and the Global Climate System committee of SCAR. This document provides a basis for assessing and understanding future climate change over Antarctica and the Southern Ocean and will be released over the next few months.
With the completion of the 2002-2003 field season, US ITASE accomplished the following technical and logistical activities: (1) the traverse traveled a total of ca. 5500 km sampling a significant portion of West Antarctica, (2) continuous radar observations (crevasse detection; 400 MHz) and shallow depth (firn stratigraphy; 400 MHz) over the ca. 5500 km of the traverse route and deep (ice stratigraphy and bedrock; 3 MHz) over ca. 3500 km, (3) twenty science sites occupied for periods of 2-6 days depending upon workload per site, (4) a total of ca. 3100 m of ice core recovered utilizing both the 3” diameter Eclipse drill purchased by NSF for use by US ITASE and a 2.2” diameter lightweight drill built by Glacier Data for the University of Maine for analyses of major chemistry, isotopes and trace chemistry at several sites, (5) permeability and porosity experiments conducted from 15 snowpits and qty 12, 18-m ice cores, (6) stratigraphy sampled at all sites utilizing snowpits excavated either exclusively for this purpose, or snowpits excavated as access for 3 ice coring, or ca. 10 m wide pits excavated using a Challenger 55, (7) ninety days of atmospheric and shallow chemistry observations conducted at twenty sites, (8) real-time, continuous near-surface observations of peroxides (H2O2 and organic peroxides), formaldehyde and ozone and ozone profiles up to an altitude of 23 km, (8) basic meteorological observations collected at all sites and 10 m depth temperatures for comparison with infrared satellite estimates of mean annual temperature, (9) twenty-five high precision GPS ‘coffee can’ experiments deployed to estimate mass balance, and (10) three AWSs deployed close to the inland deep drilling WAIS site.
US ITASE Phase 2 is a continuation of US ITASE Phase 1, with field research conducted in the same manner of traversing, stopping for cores and to perform science experiments. (approximately three-four days per coring site and 1-2 days travel between sites, depending on distance to be covered, were planned). As before, sites are preplanned, and then subject to change depending on on-site radar results. The major differences are that the traverses are conducted in East Antarctica instead of West Antarctica, the traverses are planned for two years instead of four, and the traverse will follow a continuous route from Taylor Dome to South Pole Station. A start at Taylor Dome was required because of the positioning of US ITASE platform tractors and sleds after the Light Ground Traverse (LGT) from South Pole to Taylor Dome (2003-2004).
Prior to the end of the 2002-2003 season many of the PIs submitted proposals for US ITASE Phase 2, received reviews, and were encouraged to resubmit proposals with minor modifications and to start planning for US ITASE Phase 2 by NSF. Funds were received to continue our Science Management Office (SMO) at the University of Maine. Most PIs received their grants during 2005 and SIPs were completed and submitted by April 2005 and then resubmitted with modifications in April 2006. During summer, 2006 we were informed by RPSC that the initial put-in to Taylor Dome for US ITASE preparations would be approximately Oct. 30. We were requested to have all of our personnel in McMurdo by Nov. 10-15, in expectation of a Nov. 20 put-in. Half of our traverse crew arrived in McMurdo by Nov. 8, and Welch, Koenig, Kurbatov, Flaherty, and Waszkiewicz arrived at Taylor Dome on Nov 14. The rest of the US ITASE personnel arrived in McMurdo between Nov 16-18 because of flight cancellations and lost baggage. These remaining personnel were deployed to Taylor Dome on December 4, for reasons explained below.
Steven Arcone, PI (near surface radar and crevasse radar, 10th Antarctic season, developer of crevasse radar for SPT; CRREL)
Dan Breton, Graduate Student (GPS, crevasse radar, Maine Automated Density Gauge Experiment, University of Maine)
Dan Dixon, Graduate Student (ice coring, coordination McMurdo staging, 4th Antarctic season, University of Maine)
Joe Flaherty, Graduate Student (ice coring, University of Washington)
Gordon Hamilton, PI, (co–Field Leader, GPS, accumulation rate, 12th Antarctic season, Associate Professor, University of Maine)
Lora Koenig, Graduate Student (deep radar, shallow radar, University of Washington)
Andrei Kurbatov, Research Investigator (ice coring, volcanology, 2nd Antarctic season, Assistant Professor, University of Maine)
Cathy Leiser, Cook (food organization, kitchen oversight, RPSC)
Paul Mayewski, Lead PI (Field Leader, ice coring, Field Leader >40 expeditions to the Antarctic, Arctic, Himalayas/ Tibetan Plateau, Andes, 20th Antarctic season, Field Leader for all of Phase 1 US ITASE (5500 km), Director/Professor, University of Maine)
Rick Schneider, Camp Manager (traverse platform oversight, prior Secretary (1 year) prior Chairman (5 years) of the Alaska State Board of Welding Examiners, has certified over 1000 welders, aircraft and aircraft ski designer and manufacturer and holds a patent on aircraft ski design, RPSC)
Joshua Swanson, Mechanic (mechanical oversight, maintenance and repair, RPSC, 6th Antarctic season, 5 winterovers)
Mike Waszkiewicz, Driller (oversight for ice core drilling, 17 years Arctic experience, 4th Antarctic season, Data Logging North)
BrianWelch, co–PI with Robert Jacobel (deep radar, science oversight for put-in portion of season, 4th Antarctic season, Assistant Professor, St. Olaf College).
The US ITASE Phase 2 science planned on the following accomplishments for this first year of the two-year field project.